A Java Runtime Environment (JRE) or Java Development Kit (JDK) must be available in order to run Eclipse.

Please choose compatible versions: Eclipse Luna is very old, Java 13 is much newer, hence Luna cannot recognize the JRE.

The latest release :), i.e., Eclipse 2019-12 (which will be superceded by 2020-03 on March 18).

But it has no Java IDE. Only C/C++ Project environment.

Quote:

But it has no Java IDE. Only C/C++ Project environment.

Then you probably didn't install the package you want. Did you see that there is a package called "Eclipse IDE for Java Developers"?

eclipse-java-kepler-SR1-win32-x86_64.zip

Should I port it in IDE somehow?

Quote:

eclipse-java-kepler-SR1-win32-x86_64.zip

This is *not* the newest release, in fact it's even older than Luna. I have no idea where you are looking. Is it so hard to use https://download.eclipse.org? For fundamental questions regarding download I actually suggest another forum: https://www.eclipse.org/forums/index.php/f/89/

Quote:

Should I port it in IDE somehow?

Of course you can point an existing installation to the update site containing the latest bits, but given you spoke about Luna, I strongly recommend to make a clean new installation instead of fetching many years worth of updates and fiddling around to make everything compatible. Plus: if your previous installation didn't run, then there simply is no way to install any updates.

OK. I downloaded the new eclipse-java-2019-12-R-win32-x86_64. What should I do with it? It's not like a plug-in to the Eclipse.

Evgeny Erenburg wrote on Tue, 10 March 2020 16:36

OK. I downloaded the new eclipse-java-2019-12-R-win32-x86_64. What should I do with it? It's not like a plug-in to the Eclipse.

Well, it is Eclipse IDE. Just unzip the archive then run eclipse.exe

You must have Java 8 (or higher) 64 bit installed on your system:

https://wiki.eclipse.org/Eclipse/Installation#Install_a_JVM

If you'd used the Eclipse Installer instead of unzipped a package it would have sent you to a page like this:

https://download.eclipse.org/oomph/jre/?vm=1_1_8_0_64_0&pi=http://www.eclipse.org/downloads/images/java.png&pn=Eclipse%20IDE%20for%20Java%20Developers

Thank you. Now I can open an existing project but when I try to build I get this error -
The project cannot be built until build path errors are resolved. Do I need to configure something?

• Check the error displayed in the Problems view to have more details about what is missing,
  
• Tell us what kind of project it is (Maven, plain Java, etc.),
  
• Open the project's build path (right-click on the project > Properties > Java Build Path > Order and Export) and check if a resource is marked as missing (with a little red cross)
  

Evgeny Erenburg wrote on Wed, 11 March 2020 08:55

Thank you. Now I can open an existing project but when I try to build I get this error -
The project cannot be built until build path errors are resolved. Do I need to configure something?

You are likely missing a dependency, the solution depends on what is missing exactly. Could you:

• Check the error displayed in the Problems view to have more details about what is missing,
  
• Tell us what kind of project it is (Maven, plain Java, etc.),
  
• Open the project's build path (right-click on the project > Properties > Java Build Path > Order and Export) and check if a resource is marked as missing (with a little red cross)